Flooding module and culverts

Christian Bouman

I try to fill a system of small canals with use of inlets upstream and a breach downstream. The attributes are shown below:

Inlets

• Inlet capacity: 1000000 m3
• Inlet Q: 10 m3/s
• Upper threshold: top of the canal profile
• Lower threshold: bottom of the canal
  For the breach I use the canal bottom level as breach level, the width of the canal is the breach width. I used an external water level of 0,5 m above the canal bottom.

Breaches

• Breach height: bottom of the canal
• Breach width: width of the canal
• Breach angle: ?
• External surface level: bottom of the canal
• External water level: bottom of the canal +1 m
• External area: 1000000

When I run the module, water flows around my inlet and breaches in the canals but only in the most nearby section. Canal sections connected with culverts are not filled.

I already tried the following for the culverts:

• Adjust the diameters
• Set the culvert height at the bottom of the connected canals (highest as reference)

What is happening around the culverts? And how can I prepare my project to make water flow better through the system?

Godelief

Hi Christian,

So if I understand correctly, there is now water flowing through the culverts?
Can you give me some more information about your project, for example:

• Have you imported water areas? This is an important step.
• Are the start and end points of the (line-based) culverts in a ditch/canal? It is important that they are in a water body and not start or end on land for example.
• Do the culverts where no water is flowing through, have an Attribute: ObjectFlowOutput?

If you can provide more information, I'm able to answer your questions better.